Acid Potassium Chloride Zinc Electroplating Softener
Solubilizing main brightener, auxiliary brightening effect, increase the coating thickness in low area, improve the depth capacity of the bath, reduce the surface tension of the bath, on the cathode surface wetting effect. The content in the bath is 25ml/L - 30ml/L The coating brittleness increases and passivation quality is affected by high content. The content is too low, the bright effect is not good, the coating is easy to flower, stay in the air and change color quickly.
Description
Bath maintenance
1. In the normal production process, potassium chloride, boric acid and zinc chloride are analyzed and adjusted once a week.
2. HL-93 brightener should be added according to the consumption of 60-80 ml per KA. h. When adding, it is necessary to dilute 2-3 times with plating solution.
3. HL-93 softener is generally only added when adding potassium chloride, each add 1 liter potassium chloride corresponding supplement HL-93 softener 80 ml or add 80 ml per KA. h.
4. In the normal production process, the PH value may be gradually increased, dilute hydrochloric acid can be used to reduce the PH value.
5. In the continuous plating process, the plating solution will accumulate a small amount of iron, at this time must be added to dilute hydrogen peroxide, and then filtered to remove iron impurities.
6. The first grade galvanized anode should be used. Absolutely can not use iron plate and stainless steel plate as insoluble anode, titanium blue will also be corroded, can not be used.
7. when the workpiece falls into the bath, it should be taken out in time, especially the rolling barrel must often use magnets to suck up the iron rot at the bottom of the bath.
II. Common failures and processing method
|
Problem Description |
Probable cause |
Solutions |
|
Poor brightness |
Lack of brightener Lack of softener Organic impurity pollution
|
Brightener supplement Softener supplement Activated carbon filtration |
|
Poor coverage No coating in hole and concave
|
Lack of brightener Lack of softener Low potassium chloride The bath temperature becomes higher Aluminum impurity pollution |
Brightener supplement Softener supplement Potassium chloride supplement Lowering temperature Treat with zinc powder |
|
The bright range is narrow and the coating is easy to burn
|
The PH value of the bath increases Lack of zinc Lack of boric acid Lack of softener |
Adjust PH value with dilute hydrochloric acid Zinc chloride supplement Boric acid supplement Softener supplement |
|
The coating has white mist
|
Effect of organic impurities Poor cleaning after plating |
Activated carbon filtration Change the cleaning water |
|
The coating blackening after acid dipping |
Iron impurity Copper impurity |
Hydrogen peroxide treatment and filtration Treat with zinc powder |
|
Roller holes appear in the coating
|
Lack of softener Iron impurity Excessive current Lower zinc Over loading of work
|
Softener supplement Hydrogen peroxide treatment and filtration Lower total current Zinc chloride supplement Reduced loading |
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